I tried to hook up a D5200 with the WU-1A but struggled to connect with two different iPads over the weekend. The Nikon app was able to recognize the camera, but I couldn't get wifi booth the find it. At one point it did find it but it timed out.

The Nikon WU-1a & WU-1b adapters are really poorly made, so they're very picky.
One thing you can try is Settings App -> Wifibooth -> "Disable Analytics". This reduces the internet traffic that might get sent to the WU-1a, which it really cannot deal with properly. It does mean you'll lose Facebook, Twitter, and Dropbox though.
Also make sure the distance between the iOS device and WU-1a is really small, as it has a TINY antenna

Please write a review for Wifibooth on the Apple App store! Indie developers like me really need people like you to review their apps. Instructions on how to write a review: http://goo.gl/w8NsDI.